If you’re looking for extra living space, an Accessory Dwelling Unit (ADU) could be the perfect solution—and converting your garage into an ADU is a fantastic way to make the most of unused space. Whether you need an extra bedroom, a rental unit, or a home office, a garage-to-ADU conversion can provide a versatile living space that adds both value and functionality to your property.
However, one of the most common questions homeowners have when considering this type of project is: “How much does it cost to convert a garage into an ADU?” The cost of converting your garage into a fully functional ADU can vary greatly based on factors such as size, design, location, and the level of finish you’re aiming for. In this article, we’ll break down the key factors that influence the cost of converting a garage into an ADU and help you understand what to expect.
What is an ADU?
Before diving into the costs, let’s quickly define what an ADU is. An ADU is a secondary, self-contained living unit on the same lot as a primary residence. They can be used for a variety of purposes, including as a guest house, rental unit, or space for family members. ADUs can be attached or detached from the main home, but in this case, we’re focusing on converting an existing garage into an ADU.
A garage conversion to an ADU involves transforming the structure into a livable space with all the necessary amenities, such as plumbing, electrical, and insulation, to make it comfortable year-round.
Factors That Influence the Cost of Converting a Garage into an ADU
The cost of converting a garage into an ADU depends on several key factors. Let’s take a look at the primary considerations that will affect your budget.
1. Size and Layout
One of the biggest factors in the cost of a garage conversion is the size of the garage itself. A larger garage will require more materials and labor, naturally increasing the overall cost. The layout of the garage will also impact the cost. For instance, a more complex layout with multiple rooms, custom-built features, or a bathroom will cost more than a simple one-room ADU.
On average, garage ADUs range from 400 to 1,200 square feet, with smaller conversions being more affordable. Larger, more intricate layouts will add to both the cost and the timeline of the project.
2. Level of Finish
The level of finish you choose for your ADU will also determine the cost. A basic conversion with essential features like drywall, flooring, and standard fixtures will cost less than a high-end, fully customized space with luxury materials.
Here are some examples of finishes and upgrades that can affect the price:
- Flooring: Vinyl or laminate flooring is more affordable than hardwood or tile.
- Kitchen and Bathroom: High-end countertops, custom cabinetry, and designer fixtures will increase the cost.
- Lighting: Simple lighting fixtures will be more affordable than intricate, designer lighting.
While basic finishes can save you money upfront, a high-quality finish can increase the overall value of the ADU, making it more attractive to potential buyers or renters in the future.
3. Structural Work
If your garage has existing structural issues or needs significant modifications to meet code requirements, this will add to the cost. For example, many garages are not insulated to the standards required for living spaces. Adding insulation, reinforcing the foundation, or making changes to the structure to accommodate plumbing and electrical systems will increase the price of the conversion.
Additionally, if your garage is attached to the house, you may need to make adjustments to ensure it seamlessly integrates with the main living space. This could involve changing the exterior, installing new doors or windows, and reinforcing load-bearing walls.
4. Plumbing and Electrical Work
To make your garage into a true ADU, you’ll need to install plumbing, electrical, and possibly gas lines. Converting a garage to an ADU often requires running new plumbing for a kitchen and bathroom, and adding electrical wiring for lighting, outlets, and appliances.
This is where the costs can escalate, especially if your garage isn’t already equipped to handle the added utilities. You may also need to upgrade your main electrical panel to accommodate the additional demand. Electrical and plumbing work can require permits, inspections, and professional labor, all of which contribute to the overall cost.
5. Permits and Zoning Regulations
Before you begin your garage conversion, you’ll need to obtain the necessary permits and approvals from your local zoning department. Depending on where you live, zoning regulations may limit how much of your garage can be converted into an ADU, and you may need to adhere to specific codes, such as minimum square footage or parking requirements.
The permit and approval process varies by location, but in many cases, it can take several weeks or even months to get the green light. It’s important to factor in the costs of permits and inspections when budgeting for your project.
6. Labor Costs
Labor costs will depend on the complexity of the conversion and the professionals you hire. While you can save money by doing some of the work yourself, such as painting or installing flooring, most garage-to-ADU conversions require skilled labor for tasks like electrical work, plumbing, and structural adjustments.
Hiring a licensed contractor and specialized professionals (plumbers, electricians, carpenters) will ensure that the job is done right and up to code, but this will add to your overall costs. Labor rates can vary by location and the skill level of the professionals involved, but on average, contractors charge anywhere from $50 to $150 per hour.
Average Cost of Converting a Garage into an ADU
The cost of converting a garage into an ADU can range widely, from $20,000 to $100,000 or more, depending on the size, level of finish, and scope of work. Here’s a breakdown of average costs:
- Basic Conversion: For a simple conversion with minimal upgrades (new drywall, flooring, electrical), you can expect to pay between $20,000 to $40,000.
- Mid-Range Conversion: A more detailed conversion that includes plumbing, insulation, and a full kitchen and bathroom could cost $40,000 to $70,000.
- High-End Conversion: For luxury finishes, custom designs, and significant structural changes, the cost could range from $70,000 to $100,000 or more.
The final cost will depend on the specific requirements of your project, including materials, design, and location.
How to Save Money on a Garage Conversion
While garage conversions can be costly, there are ways to save money without sacrificing quality:
- Do It in Phases: Consider completing the conversion in phases. Start with the essentials (such as electrical and plumbing) and finish the rest of the work later when your budget allows.
- Choose Budget-Friendly Materials: Opt for more affordable finishes, such as laminate flooring or stock cabinetry, to keep costs down.
- DIY When Possible: If you’re handy, you may be able to handle simple tasks like painting or installing light fixtures yourself.
Maximize Your Space with a Garage-to-ADU Conversion
Converting a garage into an ADU is a great way to add valuable living space to your property. While the cost of the conversion can vary based on several factors, including size, design, and materials, it’s possible to create a beautiful, functional ADU on a variety of budgets. Whether you’re looking for a guest suite, a home office, or a rental unit, a garage conversion can provide a versatile space that increases your home’s value.
If you’re ready to get started on your garage-to-ADU conversion, TRX Builders is here to help. Contact us today for a consultation, and let’s bring your vision to life!
